Paleoecological Significance of the Banded Iron-Formation

For rocks less than 2 years (10 9 years), the striped iron ore (BIF) is rare. It records the main events of chemical iron deposition approximately two to a month before the deposition of the oldest oxidized terrestrial sediment. The formation of big iron in this era reflects dramatic events. Due to climate change overturning, residual ferrous in the residual ocean under anoxic atmosphere may have entered a large and bright area. Previously restricted photosynthetic procaryotic flora relies on ferrous iron to maintain ambient oxygen at an acceptable level and then expands and diversifies to convert iron to insoluble iron oxide. In the absence of bio - silica secretion, the hydrosphere during the same period is saturated with H 4. The precipitated SiO 4 is advantageous for the pH near neutral. Iron oxide is added intermittently. The sporadic nature of the iron-rich band shows a periodic change in prokaryotic population, iron supply, or both. Mechanical differences between geochemically similar BIFs at the same time mean changes in turbulence and water depth. The geochemical change of the same age shows the difference in availability of O 2. Due to advanced biological oxygen regulation, continuous metabolic carbon separation, and increased oxygen supply, the iron in the sea is depleted, saturated with O 2, oxygen is released into the atmosphere and the continental red To form a layer. Rare Paleozoic BIF seems to be related to local eugenic conditions and iron volcanic sources, reminiscent of Archaean sediments. Obviously late Proterozoic sediments of Lapitan (Northwest Canada) and Jaca Dego (South West Brazil) layers remain mysterious

A large amount of iron deposits were seen in the iron layer of the strip. These strata are a type of rock in which alternating thin layers of iron oxide and less iron shale and meteorite belt alternate. These iron bands were built 3.7 billion years ago and 1.8 billion years ago. Starting from the historical time, the iron compounds mentioned are used as pigments (compared with meteorites) and also to the color of the various strata, eg Buntsandstein (Bunter, UK). In Germany's Eisensandstein (such as the Jurassic "iron sandstone" in Donzdorf and the UK bass stone) iron pigments contribute to the pale yellow color of many historic buildings and sculptures. The well-known red color of the surface of Mars comes from a weathered layer rich in iron oxide.

Volume 68, 1973, pp. 1135-1143 Paleoecological significance of the formation of striped iron ore PRESTON cloud Abstract striped iron ore formation (BIF) is rare in rocks of about 2 years (year × 109). It is the most predominant to record chemical iron deposition, the eternal, about 2 to 2.1 in front of the oldest oxidized Earth sediment. The formation of huge iron in this era reflects dramatic events. Due to climate change overturns, the iron residue in the amorphous ocean which may remain in the atmosphere has entered a large and bright area. Photosynthesis of natural microflora that was previously restricted depended on ferrous iron to keep the surrounding oxygen at an acceptable level. In the absence of secretion of bio silica, the hydrosphere during the same period is saturated with It4SiO4 and its continuous precipitation is affected by the point close to neutrality.